HOMELAND / ROMOLAND AREA DRAINAGE PLAN

Transcription

1 RIVERSIDE COUNTY CALIFORNIA HOMELAND / ROMOLAND AREA DRAINAGE PLAN Amendment No. 3 JULY 2014 By the Riverside County Board of Supervisors Prepared and Adopted Pursuant to Government Code Section 66483, et seq. and Section 10.25, Riverside County Ordinance No. 460

2 HOMELAND / ROMOLAND AREA DRAINAGE PLAN TABLE OF CONTENTS PAGE General Statement... 1 Update Requirement... 1 Drainage Fee Derivation... 2 Homeland/Romoland Area Drainage Plan, Amendment No Drainage Fee Notice to Owners, Fee Calculations and Time of Payment Findings... 3 TABLE Table 1 - Homeland/Romoland Area Drainage Plan Cost Summary Line A Subwatershed... 4 Table 2 - Homeland/Romoland Area Drainage Plan Cost Summary Line B Subwatershed... 6 MAP Area Drainage Plan...Inside Back Cover

3 GENERAL STATEMENT This plan addresses a 17.7 square mile drainage area bounded by a divide in the Lake View Mountains to the east, Rouse Road and the Double Butte Mountains to the south, the San Jacinto River to the west, and Mapes Road to the north. The plan encompasses unincorporated lands within the County of Riverside, portions of the City of Perris and portions of the City of Menifee. Currently, the area covered by this plan is located within the Third and Fifth Supervisorial Districts and includes the communities of Homeland and Romoland. An Area Drainage Plan (ADP) is a financing mechanism used to fund construction of new or improved drainage facilities. ADP fees are imposed on new land development activity within the plan area. The Subdivision Map Act requires that agencies imposing fees have a general drainage plan for the fee area, a special fund for the fees and an equitable distribution of the fees prior to implementation. To ensure that ADP fees are equitably distributed, the ADP boundaries generally follow watershed boundaries. First, the total costs of drainage facilities within the watershed are tabulated. The watershed area is then adjusted to discount publicly owned lands and steeply sloping areas that are unlikely to be developed. Finally, the total facility cost is divided by the adjusted watershed area to determine a per acre fee for the plan area. This revised ADP for controlling flood and drainage problems within the Homeland and Romoland watershed areas, prepared by the Riverside County Flood Control and Water Conservation District, concludes that construction of certain flood control and drainage facilities are critically needed to support the planned growth and orderly economic development within the plan area. These facilities, as shown on the enclosed map entitled "Homeland/Romoland Area Drainage Plan, Amendment No. 3", are intended to remedy both the existing and anticipated flooding and drainage problems within the watershed. Each of the facilities identified in either one of the documents entitled "Homeland Master Drainage Plan, Revision No. 1" dated March 2006 and the "Romoland Master Drainage Plan, Revision No. 1" dated March 2006, as approved by the Riverside County Flood Control and Water Conservation District's Board of Supervisors, including all maps and exhibits attached thereto, are adopted in their entirety as part of this plan, except where they have been excluded on the map incorporated as part of this report. UPDATE REQUIREMENT Riverside County Board of Supervisors Resolution No "Adopting Homeland/Romoland Area Drainage Plan" states in part: "That the Riverside County Flood Control and Water Conservation District is directed to prepare an update of this plan at least every two years to reflect changed conditions, inflationary or deflationary trends, revised general or specific plans, and approved development and drainage plans which will require changes in facility configuration cost estimates and drainage fees." Although the Board of Supervisors previously directed that this plan be updated every two years, the ADP fee was last updated on March 28, 2006 (Resolution No ). This is due in part to poor prevailing economic conditions and the lack of land development activity with the plan area

4 The Homeland/Romoland ADP was originally adopted on April 12, 1988 followed by Amendment No. 1, adopted April 6, 1993 and Amendment No. 2, adopted March 28, DRAINAGE FEE DERIVATION The Homeland/Romoland Area Drainage Plan, Amendment No. 3 proposes the construction of various open channels, underground storm drains and detention basins. These facilities have been organized into two separate and distinct drainage systems, Line A" 1 and Line B". The proposed alignment and size of the various facilities proposed for each system are shown on the attached map. The Homeland/Romoland Area Drainage Plan, Amendment No. 3 presented herein provides an economical means of conveying storm runoff through the studied area. When completed, the proposed facilities will provide the Homeland/Romoland area with a flood control system that will provide improved drainage and protection from the one-percent annual chance flood event ( 100- year" frequency storm). Supporting data for all proposed facilities is available at the Riverside County Flood Control and Water Conservation District office. It should be noted that underground storm drains less than 36 inches in diameter, as shown on the enclosed map, are excluded as part of the Homeland/Romoland Area Drainage Plan, Amendment No. 3 (with the exception of the 27-inch storm drain in the Line 2 system which serves as an outlet to the proposed Melba Basin). Drains that are smaller than 36 inches are considered local drainage facilities to be addressed by development as deemed necessary. Facilities that measured 33 inches in diameter in the Homeland/Romoland Area Drainage Plan, Amendment No. 2 have been upsized to 36 inches in diameter to reflect standard pipe sizes currently offered by concrete pipe manufacturers; therefore, these facilities have now been included as part of the Homeland/Romoland Area Drainage Plan, Amendment No. 3. In an effort to fairly apportion the drainage fee within the plan area, the proposed drainage fee is divided into two separate sub-watersheds corresponding to the runoff tributary to the Line A and Line B drainage systems. The southerly watershed area, hereinafter called the Line A Sub-Watershed", contributes runoff to only the Line A drainage system; therefore, the corresponding Line A drainage fee is derived on the basis of the total cost of Line A system divided by the developable area of the Line A watershed. Similarly, the northerly watershed area, hereinafter called the Line B Sub- Watershed", contributes runoff to only the Line B drainage system; therefore, the corresponding Line B drainage fee is derived on the basis of the total cost of Line B system divided by the developable area of the Line B watershed. In addition, because the District anticipates that it will sell promissory notes in order to expedite the construction of the Line A drainage system, the estimated cost of borrowing money has been included in the Line A drainage fee derivation. HOMELAND/ROMOLAND AREA DRAINAGE PLAN, AMENDMENT NO. 3 It is the District's recommendation that the Board of Supervisors revise the drainage fees as follows: $21,052 per acre for the Line A Sub-Watershed and $15,505 per acre for the Line B Sub-Watershed. These revised fees reflect the latest construction and right of way cost estimates. Construction costs 1 The Line A system also includes various Homeland Master Drainage Plan facilities including Line 1", Juniper Flats Basin" and Briggs Road Basin"

5 are estimated on the basis of 2014 unit prices developed by District staff using the latest information from public works projects administered by the District. Right of way cost estimates are based upon recent sales in the Homeland and Romoland area. The estimated total cost of constructing the drainage facilities required by the Homeland/Romoland Area Drainage Plan, Amendment No. 3 is $158,507,303. The cost summary for each facility is shown in Table 1 and Table 2 at the end of this report. Costs reflected in this report vary from the Homeland/Romoland Master Drainage Plan due to the exclusion of facilities below 36 inches in diameter and costing Line A, downstream of Ethanac Road as an interim channel with ultimate crossings. As a condition of approval for the filing of a final Subdivision Map or Parcel Map, the required drainage fee and the time and method of payment are as follows: 1. Drainage Fee The current drainage fee is $21,052 per acre for Line A Sub-Watershed and $15,505 per acre for Line B Sub-Watershed. For subdivisions of lots greater than one acre in size, the fee shall be applied on a "per lot" basis, except for commercial, industrial and manufacturing lots. 2. Notice to Owners, Fee Calculations and Time of Payment The Riverside County Board of Supervisors has adopted the "Rules and Regulations for Administration of Area Drainage Plans", dated June 10, 1980, and as amended, formally setting forth numerous administrative policies for implementing this and other Area Drainage Plans within Riverside County. Among other provisions, the document defines the notification requirements to owners and sets forth the computation methods for calculating the drainage fee applied to each lot. Section IX.3 of that document also determines the administrative provision to permit alternative time of payment of the drainage fees. Said "Rules and Regulations for Administration of Area Drainage Plans", dated June 10, 1980 and as amended, is hereby made a part of the Homeland/Romoland Area Drainage Plan, Amendment No. 3. FINDINGS The Board of Supervisors finds and determines that: 1. The purpose of the drainage fee is to provide a fund for flood control and drainage facilities identified within the Homeland/Romoland Area Drainage Plan. 2. The drainage fee will be used to finance the design and construction of those flood control and drainage facilities which are part of Homeland/Romoland Area Drainage Plan. 3. The subdivision and development of land within the Homeland/Romoland Area Drainage Plan requires the construction of the facilities described in the plan. 4. The required drainage fee is fairly apportioned within the described area, both on the basis of benefits conferred on properties that are proposed for subdivision and on the need for drainage facilities that is created by the proposed subdivision or development of all properties within the drainage area. P8/

6 TABLE 1 HOMELAND/ROMOLAND AREA DRAINAGE PLAN AMENDMENT NO. 3 COST SUMMARY LINE A SUBWATERSHED FACILITIES CONSTRUCTION* RIGHT OF WAY TOTAL COST Line A $22,919, $10,294, $33,213, Line A-1 $2,114, $0.00 $2,114, Line A-1A $995, $0.00 $995, Line A-2 $2,610, $928, $3,538, Line A-3 $8,599, $1,173, $9,772, Line A-3A 2 $362, $0.00 $362, Line A-3B 2 $100, $0.00 $100, Line A-3C $282, $0.00 $282, Line A-3D $1,230, $0.00 $1,230, Line A-4 $3,466, $1,068, $4,534, Line A-5 $1,479, $53, $1,532, Line A-7 $813, $0.00 $813, Line A-8 $1,614, $586, $2,200, Line A-9 $360, $0.00 $360, Line A-10 $929, $0.00 $929, Line A-11 $1,153, $280, $1,433, Line A-11A $319, $140, $459, Line A-11B $315, $175, $490, Line A-12 $3,198, $0.00 $3,198, Line A-13 $798, $140, $798, Line A-14 $1,007, $264, $1,271, Line A-14A $425, $0.00 $425, Line A-15 $4,860, $315, $5,175, Line A-15A $320, $0.00 $320, Line A-16 $178, $0.00 $178, Line A-17 $250, $0.00 $250, Line A-18 $250, $0.00 $250, Facilities less than 36 inches in diameter are excluded as part of the Homeland/Romoland Area Drainage Plan, Amendment No. 3 (see page 2)

7 TABLE 1 (cont.) HOMELAND/ROMOLAND AREA DRAINAGE PLAN AMENDMENT NO. 3 COST SUMMARY LINE A SUBWATERSHED FACILITIES CONSTRUCTION* RIGHT OF WAY TOTAL COST Line 1 $12,008, $1,041, $13,049, Line 1A $1,260, $0.00 $1,260, Line 1B $542, $210, $752, Line 1C $441, $131, $572, Line 2 $6,346, $177, $6,523, Line 2A $170, $0.00 $170, Line 2B $168, $0.00 $168, Line 2C $1,084, $0.00 $1,084, Line 2CA $268, $0.00 $268, Line 2D $120, $0.00 $120, Line 3 $370, $0.00 $370, Line 4 $1,210, $735, $1,945, DETENTION BASINS: Briggs Road Basin $7,257, $4,000, $11,257, Juniper Flats Basin $6,295, $4,900, $11,195, Melba Basin $446, $385, $831, SUBTOTAL $98,950, $26,995, $125,805, INTEREST** $4,948, TOTAL $130,753, * Includes 40% for Engineering, Administration, MSHCP fee and Contingencies. ** Estimated cost of funds to be paid by the District to expedite construction of Line A, Line 1, Line A-2, Line A-3, Briggs Road Basin, and Juniper Flats Basin

8 TABLE 2 HOMELAND/ROMOLAND AREA DRAINAGE PLAN AMENDMENT NO. 3 COST SUMMARY LINE B SUBWATERSHED FACILITIES CONSTRUCTION* RIGHT OF WAY TOTAL COST Line B $8,723, $4,043, $12,766, Line B-1 $4,865, $578, $5,443, Line B-2 $1,008, $420, $1,428, Line B-3 2 $0.00 $0.00 $0.00 Line B-4 $1,139, $420, $1,559, Line B-5 $869, $140, $1,009, Line B-6 $556, $228, $784, DETENTION BASIN: Mapes Basin $936, $3,675, $4,611, Mapes Levee $72, $79, $151, TOTAL $18,170, $9,583, $27,753, * Includes 40% for Engineering, Administration, MSHCP fee and Contingencies. TOTAL PLAN COST $158,507, Facilities less than 36 inches in diameter are excluded as part of the Homeland/Romoland Area Drainage Plan, Amendment No. 3 (see page 2)